(2006). Pictograms, icons & signs: A guide to information graphics / Rayan Abdullah, Roger Hübner.
Čikaški stil citiranja (17. izdanje)Pictograms, Icons & Signs: A Guide to Information Graphics / Rayan Abdullah, Roger Hübner. 2006.
MLA način citiranja (9. izdanje)Pictograms, Icons & Signs: A Guide to Information Graphics / Rayan Abdullah, Roger Hübner. 2006.
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